1. Yes, it has.
2. The atomic space and energy age was followed by the age of computer.
3. Using computers and the internet develops important skills in young people. Teens can visit different countries and cities. They meet new people and communicate with their peers from different countries. They learn a lot about the life of people from other countries. Young people find a lot of useful information in the Internet.
4. Yes, they do.
5. Internet is very useful, because it is a huge base of data and knowledge, where you can find any thing you want from movies and music of interest to the vast number of books, newspapers and magazines.To find more information, download the required essay, watch video about some books which you have already read, everything can be done through the Internet.
6. Many devices became compatible with computer during the last years, such as mobile phones, navigators and etc.
7. Yes, I can.
8. Of course, I like such communication but I prefer real one.
9. Computer games are probably also a part of our free time and for many people it becomes impossible to tear themselves away.
10. Yes, they do.
11. Yes, he does.
12. I agree with this article. I don't mean that I am against computer and the Internet, but it should have reasonable limits.
52x2-1-3*5(x+1)(x+2)-2*56(x+1)=0
Раскроем скобки в показателях степеней:52x2-1-3*5x2+3x+2-2*56x+6=0Вынесем 56x+6 за скобки:56x+6*(52x2-6x-7-3*5x2-3x-4-2)=056x+6=052x2-6x-7-3*5x2-3x-4-2=0Выражение 56x+6=0 не имеет решения, т.к. an≠0. Представим 52x2-6x-7 как 52(x2-3x-4)+1 и обозначим 5x2-3x-4 переменной t. Получим:5t2-3t-2=0По теореме Виета получим корни:t1=1t2=-2/5Корень t2=-2/5 не будет удовлетворять уравнению, т.к. положительное число в любой степени больше нуля. Подставим вместо t - 5x2-3x-45x2-3x-4=1Заметим, что 1=505x2-3x-4=50Приравниваем показатели:x2-3x-4=0D=9+16=25, D>0, следовательно, уравнение имеет два действительных корня:x1=(3-5)/2=-1x2=(3+5)/2=4ответ: x=-1 и x=4.Пример №2
122см*3= 366 см
400 см + 366 см = 766 см = 7м 66см
1 кг = 1000 г
322г*3 = 966г
1000г - 966г = 34г
6м = 600см
241см * 2 = 482см
600см - 482см = 118см = 1м 18см